verifier.js

var BASE_URL = "https://dauth.co/";
var axios = require('axios');
var crypto = require('crypto');
var cryptico = require('cryptico');

router.get("/", function(req, res, next){
    var username = req.query.username;
    var code = req.query.code;
    var hashcode = req.query.hashcode;
    var urlGetter = BASE_URL + "utils/url?username="+username;
    var addressGetter = BASE_URL + "utils/address?username="+username;
    var keyGetter = BASE_URL + "utils/key?username="+username;
    axios.get(urlGetter).then(function(aUrl){
	axios.get(keyGetter).then(function(aKey){
	    var tokenRaw = crypto.createHash('sha256').update(Math.random().toString()).digest('base64').substr(0,10);
	    var encrypted = cryptico.encrypt(tokenRaw, aKey.data, "").cipher;
	    axios.post(aUrl.data+"?action=verify", {username:username,code:code, hashcode:hashcode, cipher: encrypted}).then(function(decrypted){
		if(decrypted.data == tokenRaw){
		    axios.get(addressGetter).then(function(address){
  		        //redirect to success page
		    }).catch(function(error){
		        //redirect to login failed page
		    });
		    return;
		}
		//redirect to login failed page
	    });
	}).catch(function(error){
		//redirect to login failed page
	});
    }).catch(function(error){
		//redirect to login failed page
    });

});